In a Potts state, cells are classified into types with different features [1]}.
In the model proposed in this paper, two categories of cells are introduced to represent the two tissues corresponding to the two different heterophilic adhesion molecules binding with each other. Each model cell is of either of these two types and can participate in heterophilic adhesion only with cells of the other type. The type of the \(m\) th cell is denoted by \(T(m)\) .
\(T(m) = 1\)  corresponds to a polarized concentration of heterophilic adhesion molecules and \(T(m) = 2\)  corresponds to an isotropic concentration. In the dicty slug depicted in Fig. REF (b), the cells with \(T(m) = 1\)  correspond to the prestalk tissue and those with \(T(m) = 2\)  correspond to the prespore tissue.
